.btn{
    background: #1D82FE;
    position: fixed;
    bottom: 0;
    width: 100%;
}

.cover-body{
    width: 100%;
    height: 100%;
    z-index: 999;
    opacity: 0.4;
    background: #000000;
    position: absolute;
}

.dialog-div{
    position: absolute;
    background: #ffffff;
    border-radius: 4px;
    width: 5rem;
    height: 4rem;
    z-index: 9999;
}